quote:-->"Written-Pole motors differ from conventional motors in the way the magnetic field is developed. In a conventional motor, the poles are in fixed positions. In a Written-Pole motor, a magnetic layer is written in different places on the motor's poles as the rotor turns.

Written-Pole motors are available in sizes from 15 to 75 horsepower. They are totally enclosed and fan-cooled. With high starting-torque characteristics they run at true synchronous speed.

Varying the magnetic poles during startup gives the motor its slow-starting, high torque characteristics. A squirrel cage winding in the motor also adds induction torque for starting."

this quote is from "http://www.es.wapa.gov/pubs/esb/98Feb/at_motor.htm"

hope this helps to clarify..... [Linked Image]

gramps